Getty ImagesUPDATE: French media said Wednesday morning that the alleged gunman in Monday's school shooting in Toulouse has been arrested. Police have denied those reports.

(TOULOUSE, France) -- The gunman who is believed to have been terrorizing southwestern France for the past week-and-a-half is surrounded by police Wednesday after they launched an early morning raid on the suspect's home in Toulouse.

The shooter, who has been identified as Mohammed Merah, a 24-year-old Frenchman of Algerian origin, is accused of opening fire and killing four people, including three children, at a Jewish school in Toulouse on Monday. He has also been tied to the deaths of three paratroopers who were gunned down in two separate incidents last week in the Toulouse area.

Negotiations have been underway with the suspect, who, according to officials, said he would surrender later in the day.

Comstock/Thinkstock(SARAJEVO, Bosnia) -- The U.S. embassy in the Bosnian capital Sarajevo was locked down Friday, after shots were fired outside the building, injuring at least two officers.

The gunman, identified by Bosnian media as 23-year-old Serbian Mevlid Jasarevic, is a suspected radical Islamist, according to Britain's Daily Mail. Photos of Jasarevic show him clenching an AK-47-style assualt rifle and shooting at random civilians and police.

The Bosnian president reportedly believes the shooting spree to be an act of terrorism.

Police sharpshooters shot and wounded Jaserevic, who was arrested on site. After being treated on the scene, he was hospitalized.

The area has been sealed off and a search is underway for any possible accomplices.

(FRANKFURT, Germany) -- A gunman shouting in Arabic opened fire on a bus carrying U.S. airmen in Frankfurt, Germany, Wednesday, killing two and wounding two others before his gun jammed and he was subdued, officials said. An ethnic Albanian from Kosovo was taken into custody.

The FBI is heading an investigation into the incident because U.S. citizens were killed and it wants to determine whether the shooting was an act of terrorism.

President Obama reacted to the deadly shooting by saying, "I am saddened and I am outraged by this attack." The president said U.S. investigators would work with German authorities and "spare no effort" to ensure that "all of the perpetrators are brought to justice."

Mr. Obama added that the killings were a "stark reminder of the extraordinary sacrifices" of American servicemembers.

Sources told ABC News the victims were at Frankfurt airport on a bus marked United States Air Force. It was carrying 13 or 14 people, plus the driver. U.S. investigators are trying to determine whether the shooting occurred while the gunman was on the bus or while he was trying to board the bus.

When he opened fire, the gunman shouted "Allahu Akbar," meaning "God is great," according to sources. He fired nine times before the gun jammed and he was subdued by other passengers. While being wrestled into submission, the suspect shouted either "Jihad Jihad" or "Allahu Akbar," sources said.

One of the dead was the bus driver, military officials said. The names of the deceased are being withheld pending notification of next of kin.

The U.S. service members who were attacked were members of a security forces team assigned to RAF Lakenheath in Great Britain. They were being transported to Ramstein Air Base in Germany, en route to support overseas operations, although their exact destination was not stated.

The gunman was identifed by sources to ABC News as Arid Uka, although other spellings give his name as Arif Uka. Although he has lived in Germany for years, he is a citizen of Kosovo and his family is from the northern town of Mitrovica.

U.S. intelligence officials are running Uka's name through terrorism data bases to determine if he has come to their attention previously.